Glass blowing machine



Aug. 11, 1931. E. H. LORENZ ,3 8,

' GLASS BLOWING MACHINE Criginal Filed Aug. 8. 1921 5 Sheets-Sheet 1 mg m %m w m 4. mm m k 1. UH A Z W "m m H -H .H \v m Aug. 1931. w E. H. LORENZ 1,818,725

GLASS BLOWING MACHINE Criginal Filed Aug. 8, 1921 5 Sheets-Sheet 2 Inventor Edward IiLarenz H t torne y.

Aug. 11, 1931. LORENZ 1,818,725

GLASS BLOWING MACHINE Original Filed Aug. 8, 1921 5 Sheets-Sheet 3 Inven tor Edward liLorenz Attorney.

Aug. 11, 1931. E. H. LORENZ GLASS BLOWING MACHINE 5 Sheets-Sheet 4 I z w m w 3 mm m w w m L NE w u -om 5n n 0mm 9 J n w .3 d m E y n .vd NM. b on 0 1931. E. H. LORENZ 1,818,725

GLASS BLOWING MACHINE Original Filed Aug. 8 1921 5 Sheets-Sheet 5 .f'Y/gli. .Fjgm 7. 362

A "AL 5' A 3 3 365 363 359 359 35a Inventor Edward H. Lorenz Q mm 52% Patented Aug. 11, 1931 UNITED STATES PATENT OFFICE EDWARD H. LORENZ, OF WEST HARTFORD, CONNECTICUT, ASSIGNOR, BY MESNE AS- SIGNMENTS, TO HARTFORD-EMPIRE COMPANY, OF HARTFORD, CONNECTICUT, A COBr- PORA'IION or DELAWARE GLASS nLowme MACHINE Original application filed August 8, 1921, Serial No. 490,567. Divided and this application filed February L 11, 1928. Serial No. 253,689.

cation is a division of my copending application, Serial No. 490,567, filed Aug. 8, 1921, for glass shaping machine, now Patent No.

Among the objects of the present invention are to provide a device having means for distributing air to the several blowhead's of a blowing machine of the turret type wherein a blowhead is provided in combination with each pair of molds, said pairs each comprising a parison mold and a finish blow mold. It is sometimes desirable to use diiferent pressure-s for the counter-blowing of the parison and the finish blowing of the ware, and, therefore, this invention is designed to provide means for distributing air of the desired diiferent' pressures.

A further object of the invention is to provide means for turning on and cutting oif the blowing pressure for each of the blows at any predetermined time at the will of the operator either during or betweenthe dwells of the intermittently rotating turret, whereby the time of each blow and the interval between them may be varied at will.

A furtherobject of the invention is to provide a blowhead adaptable for use in connection with this and other machines of this general type, specifically one in which there is a piston member. to move the mold-engaging parts into operative position and in which the movement of this piston member is so cushioned as to prevent shocks in the machine- A further object is to provide means associated with the piston of the blowhead, whereby the blowing pressure will not be admitted to the ware until the piston is moved to bring the mold-engaging parts into operative position, thus preventing the admission of pres sure to the mold cavity outside the article being blown. f

A further object is to provide a blowhead for use with a machine of the character described, so arranged that it may be adjusted manually to the approximate location of the mold in two lateral directions at right angles to one another and in a vertical direction to accommodate various types and sizes of molds, and also to providem'eans whereby the mold-engaging parts will automatically center themselves with respect to the mold to compensate for minor inaccuracies in the positioning or construction of the molds.

Other objects and advantages of the present invention will be apparent from a reading of the following specification and subjoined claims when taken in connection with the accompanying drawings, in which:

Figures 1 to 8, i elusive, are diagrammatic views illustrating he principal steps in the formation of a bottle by the machine of the present invention;

Fig. 9 is a plan view of the machine; Fig. 10 is a side elevation looking from the left of Fig. 9 with the lowerpart broken away;

Fig. 11 is a partial vertical section through the turret taken substantially on the line 11 inFig.9; v

Fig. 12 is a-sectional detail showing particularly the engagement of the blowhead and the neck of the bottle protruding from the blow mold;

Fig. 13 is a horizontal section of the air distributing head, taken on the line 1313 in Fig. 11; t

Fig. 14 is a horizontal section of the blowhead, taken on the line Pi -14 in Fig. 11;

Fig.15 is a plan view; and

Figs. 16, 17, 18 and 19 are elevations partly in section, showing in detail the construction and arrangement of the devices for operating the blow valves.

General operation-The machine is provided with aseries of pairs of molds,,each pair comprising a parison mold and a blow mold arranged side by sid e on a rotatable head, with their neck portions extending in opposite ,directions. The head is mounted to rotate on a horizontal axis extending radially of a rotatable carrier, hereinafter called a pairs of molds successively to a series of operating stations where various steps indicated in Figs. 1 to 8, are performed in the shaping of the ware, although certain operations are or may be performed while the molds are moving from one station to the next. In the illustrated embodiment of the inventions, there are six pairs of molds and six operating stations, the latter being indicated by letters A, B, C, D, E and F.

Figs. 1 to 8 illustrate diagrammatically the several steps in the production of the bottle. Fig. 1 illustrates the first operation which takes place when a pair of molds are at the mold charging station A, at which a mold charge 51 is delivered to the parison mold, of which the bottom end, having a larger opening for receiving-the charge, is preferably uppermost. The blow mold has the neck end up and contains a previously formed bottle 52. The neck end of the parison mold is closed by a neck ring 96 and a alt neck pin 214. The settle blow operation, also performed at statlon A, is shown in Fig. 2 where a blowhead 168 has moved over the mold and compressed air is admitted therethrough, forcing the glass downward in the mold, and settling it compactly in the neck ring and around the neck or finish of the bottle.

The turret is then rotated through a sufficient angle to present this pair of molds at the counterblow station B. During this movement, the molds are inverted, so that they arrive with the neck end of the parison up, and the neck end of the blow mold down, as shown in Figs. 3 and 4.

A parison bottom plate 245 moves up to close the bottom of the parison mold, a blowhead 266 (Fig. 4) moves into contact with the neck ring, and compressed air is admitted causing the glass to expand and fit the mold and complete the parison 53. This is known as the counterblow.

The pair of molds now moves to the transfer station C where the parison is transferred from the parison mold to the blow mold, (Figs. 5, 6 and 7). The neck ring 96 has been opened during its travel to station C, and the projecting neck of the bottle is engaged by jaws 267 (Fig. 5), forming a part of the transfer tongs. Both molds are now opened, leaving the parison suspended by the jaws 267 (Fig. 6), and releasing the previously finished bottle 52 from the blow mold. The molds are reverted and made to exchange positions during their dwell at this station by a half rotation of the head, thus bringing the open halves of the blow mold around the suspended parison which has meanwhilerremained substantially stationary. The molds now close, enclosing'the parison within the blow mold (Fi 7) and leaving the empty parison mold wit its neck portion down.

pin, to shape the top The parison is next expanded to final form by the finishing blow. The parts for performing the finishing blow travel with the molds and, therefore, it is not necessary for this operation to stop the molds at fixed stations, as is done for certain other operations, but the blow may be continuous during both the dwells and the movement of the turret. It is one of the objects of the invention to arrange the finish blow mechanism so that the blow may be begun at any desired time after the molds leave station 0, and may be continued for any'desired time'throughout the range of three stations, D, E and F, called blow stations. The final blow may be timed to allow the parison to elongate and its chilled skin to reheat before blowing as desired, thus giving some control over the setting of the bottle in its final form. These factors should be adjusted to suit the requirements of different sizes or types of ware.

As the molds move toward the first blow station D, the blowhead 266 moves into communication with the neck of the parison. A

bottom plate 86 is provided for cooperation.

with eachvof the finish blow molds and travels therewith, sothat when the molds are closed, this bottom plate Will be in operative position. At any desired time thereafter, air is admitted through the blowhead, expanding the parison to the form of the finished bottle 52, as shown in Fig. 8.

At stations D, E and F and during the traverse of the mold between stations, the same conditions prevail as shown in Fig. 8, although the blowing. pressure may or may not be acting all the time. After leaving station F the cycle of the machine is complete, the empty parison mold being now in position to receive another charge and a finished bottle being carried by thefinishing mold.

The molds in this invention are held in mold carriers which resemble double ended the same arm as the'diagonally opposite half of its associated parison mold, the details of the mold construction .being shown in my copending application above referred to.

BZ0w7zead.The blowheads, one of which is associated with each pair of molds, act at the counterblow station B and again at a time after themolds leave the transfer station C, as determined by the adjustment of the machine. The blowhead is moved vertically toward and from the left hand mold of each pair,'and which mold is to receive.

the blow is determined by the inversion of the molds; a rotation of 180 degrees of the molds around a horizontal'axis serving to reverse their positions with relation to the blowhead. In order to provide clearance for certain parts of the machine, the blowheads are arranged to be swung away laterally from a stem 303. A stud 304 is screwed into the stem and a nut 305 on the stud holds a cup 306 1n place on the top of the stem 303. The piston is held in elevated position within the cylinder by a spring 307 confined between the "fiang on the cup 306 and a disc 310 resting on the upper surface of the cylinder.

The parts which contact with the blow m d or the neck ring of the parison mold, as the case may be, are carried by the piston 302. As shown in Fig. 11, the'blowhead is cooperating with a parison mold and holding the neck rin ring 311 arranged to engage the tapered sides thereof. The ring 311 is carried by studs 312 mounted in the piston 302 and held yieldingly downward by springs 313. When the blowhead is applying the finishing blow to the blow mold, the top of which is of the same shape outside as the top of the neck ring, the similarly tapered top of the blow mold is held closed in the same way (Fig. 12).

The upper surface of the neck ring, or of the blow mold, during the finishing blow, is engaged by a cup 314 attached to a bushing "315 mounted in a bore within the stem 303 302 continues its downward movement com pressing the springs 313 and 316 until it is stopped by engagement with the upper end of the cup 314.

-It sometimes happens that the upper surface-of .the neck ring or blow mold is not exactly-horizontal, and in order that the cup: 314 may make an air tight connection with this surface. it is loosely mounted in the piston 302, The bushing 315 is enough smaller than the hole in which it is carried, to permit the cup to tilt as it engages the high side o f the neck ring, and in order to make an air tight connection between the upper surface of the cup and the center of the piston.

a washer 321 is provided, having itslower surface formed to receive a spherical seat in the upper end of the cup. Thus, if the cup is tilted, the washer is free to slide from one sideu-to the other and form an air tight connection between the piston and the cup, be-

B ing in effect a sliding ball joint.

96 in closed position by a clamp.

, through a suitable The lateral position of the molds with respect to the blow-head may vary slightly in the different pairs of molds, and in order that the position of the mold-engaging parts of the blowhead may be adjusted to correspond to the position of themolds, provision is made for ad usting these parts with relation to the blowhead arm 301. For this purpose, the mold-engaging-parts' are eccentrically mounted, so that their notation moves them laterally as seen in Fig. 11. The cylindrical cav ity within the stem 303 is made eccentric with respect to the piston 302 (Fig. 14) and by turning the piston 302 within its cylinder, the mold-engaging parts may be adjusted 10ngitudinally with relation to, the arm 301, into alignment with the mold. In order that the piston may be locked in its adjusted rotative position with respect to the arm, the stem 303 is splined to'receive a pin 322Jnounted in the disc 310, held from rotation by clampin it beneath a cover 323 by meansof screws 32 When theposition of the mold-engaging parts is to be adjusted, the connection: between the arm 301 and its verticalsupporting rod 325 is first released by loosening screws 326 which clamp the arm onto the rod. The screws 324 are then loosened to free the disc 310, after which the piston 302 may be turned as far as may be necessary to bring the mold-engaging parts into proper register, and if this results in angular dison the shaft 325. The various screws are then tightened to hold the parts in adjusted position. Thus it will be seen that provision is a made for adjusting the mold-engaging parts in two lateral directions at right angles to one another. I

The connection between the parison in the blow mold and the blowhead difi'ers slightly during the finishing blow from that previouslfy described' The top of the parison projects rom the surface of the blow mold (Figs. 10 and 12), and it has been found desirable to direct the blowing pressure directly into the neck of the parison while substantially excluding it from the exterior thereof, in order to prevent the likelihood of leakage of the blowing air into the blow mold outside of the parison, which would,prevent the latter from being fully expanded. The blowing pressure is directed into the neck of the parison by a perforated disc 327 screwed into the interior of the cup 314 to such a position that it will engage the top of the parison slightly before the cup engages the surface of the blow mold. The air pressure for the blowhead is transmitted from the interior of the rod 325 port into the arm 301. When-the piston 302 1s in the uppermost position in whlch it is held by the spring 307 air is admitted above the piston throng a ort 328, the effective area of which. is adustable by means of a screw 329. The size a on the mold. At about the same time that the port 330 is uncovered, ports 331 in the stem 303 are opened so as to admit'blowing pressure through the hole in the bushing 315 to the inside of the cup 314 from which it is transmitted to the parison. By this arrangement, a single air pressure acts first to move the mold-engaging parts into opera+ tive position and thereafter to blow the parison.

It is sometimes desirable that the air pressure used for the finishing blow shall be higher or lower than that used for the counterblow, and as this invention employs a single blowhead for both the counterblow and the finishing blow, means are provided for supplying different air pressures to the blowhead for these respective blows. For

, this purpose a distributor is provided, which at one time connects the blowhead with air at one pressure, and at another time, with air at another pressure. The application of pressure to the blowhead is controlled by a valve 334 (Figs. 9, 10, 11' and 15) located between the distributor and each blowhead.

The blowhead is capable of certain vertioal movements and, therefore, the connection between the valve and the blowhead is telescopic. The valve is connected with the rod 325 by a pipe 335 sliding inside the rod, a suitable stufling box 336 beingprovided to make an air tight connection. Air pressure is transmitted to the .valve through a pipe 337 and the connection between this pipe and the pipe 335 is controlled by a plunger 338 sliding in the valve, and provided with ports which at times complete the connection between the two pipes.

The mechanism for supplying different air pressures to the valve 334 and thence to the blowhead, comprises a distributor 339 positioned at the center of the machine above the turret (Figs. 10 and 11). This distributor comprises a cylindrical member 340 held from rotation by an arm 345 and stud 346, on which is mounted a rotatable casing 341 (Figs. 11 and 13), carrying six of the radial pipes 337, one pipe leading to each of the valves 334 (Fig. 9). curs at station B, and therefore the construction of the distributor is such that any one of the pipes 337 while in position to communicate with this station, is connected'with air of the pressure desired for the counterblow operation, through chamber 347, pascircumferential extent to communicate with.

sage 348 and pipe 349. The member 340 is provided with a channel 342 of suflicient all, of the pipes 337 which may beemploye-d The counterblow ocfor the finishing blow. Air is supplied to the channel 342 through a passage 343 and a pipe 344 leading to a source of air pressure desired for the finishing blow.

The blowhead is moved vertically by a lever 588 (FigsflO and 11), having one end forked and provided with rolls engaging with an annular groove 589 formed between the upper surface of the hub of the arm 301 and a collar 590 fixed on the rod 325. The lever 588 is pivotally mounted on a bracket 591 secured to the turret 85, and its other end is provided with a cam roll engaging a cam path 592, formed on the surface of the fixed cylinder 352. As the turret advances to present the molds t0 successive stations, the lever causes the blowhead to be elevated and depressed at the proper time during the forward movement of the turret.

The blowhead is swung laterally, as it approaches its upper position, in order to avoid interference with certain parts of the machine, by a roll 593 (Figs. 10 and 11) projecting radially from the rod 325, and en gaging a cam path 594 formed in a bearing 595 in which the rod 325,.is supported for vertical movement. The shape of the cam path 594 is such that as the rod 325 approaches its highest position, the blowhead will be swung away from a position in vertical alignment with the mold as shown at station F (Fig. 9) and to one side into the positions shown at station A.

One of the important features of this invention. residesin the construction by which the duration of the reheating period, during which the parison is allowed to equalize its temperature before blowing, and the duration of the period during which blowing pressure is applied to the parison or bottle, may each be freely adjusted in accordance with the character of the glass and the ware. In making certain types of ware, it'is desirable that a period shall elapse between the transferring of the arison and the beginning of the finishing blow, in order that the chilled skin or enamel on the surface may have time to absorb heat from the interior of the parison to render it more plastic, and this time varies greatly in accordance with the character of the ware. It is also desirable that the duration of the finishing blow I vision is made for opening and closing the I,

blow valve 334 at anytime, whether the molds are moving or stationary. By setting the valve opening mechanism so that the blow is started after the desired reheat ing period, this period may be varied at will, and by setting the valve closing mechanism tion by movement of the plunger 338 into the position shown in Figs. 11 and 16, by a trip 351 pivotally mounted at 350 on a stationary drum 352 (Figs. 9, 10 and 16), and it is closed by a trip 353 also mounted on the drum 352. during the dwell of the molds at station B,

the valve opening and closing trips 351 and 353 may be permanently secured to the drum 352 by screws 354 (Fig. 11), in operative relation'to the valve while at this station. Or they may be adjustably clamped by T-bolts 365, in a circumferential T-slot 359. The trips are arranged to move theplunger 338 longitudinally to open the valve by the engagement of the trip 351 with the upper end of a pin 355 mounted in the plungerv (Fig. 16), and to close the valve by the engagement of a shoulder 356 on the trip 353 with the opposite side of the lower end of the pin 355 (Fig. 17)

The valve opening trip 357 and the valve closing trip 358 (Figs. 9, 15, 18, 19) which control the valve for the finishing blow, are similar to the corresponding trips 351 and 353 employed at the counterblow station, but as the period of the finishing blow is adjustable so as to occur during all or any part of the time after the molds leave station C until they are about to leavestation F, these finishing blow trips are adjustably clamped in the T-slot 359 of the drum 352 by bolts 365, so that the trips may be adjusted circumferentially in the slot and clamped therein by the T-bolts.

These four trip devices are turned to actuate the valves by means of cam or wiper surfaces rotating past the trips in suitable position and sequences, anti-friction rolls being preferably employed wherever convenient. An approved arrangement is herein shown whereby the actuating members are in the form of rolls 317, 318, 319 and 320 (Figs. 16-19). For convenience in adjusting these rolls or wipers, they are preferably, as herein shown, mounted on blocks 363, adjustably secured by suitable bolts in T-slots 361 extending circumferentially around the constantly rotating drum 362. These four rolls which, for conciseness of expression, are herein termed wipersand the co-engaging arms of the respective trips actuated by them are disposed at four different levels (Figs. 16-19) to avoid interference with each As the counter-blow usually occurs other. justment of the timing is necessary, these cam surfaces or wipers might be disposed in fixed relation around the periphery of a rotating cam occupying the position of the drum 362.

The drum 362 is secured on the upper end of the. shaft 366, and is rotated constantly at a ratio of six revolutions of the drum to one complete revolution of the turret, or once for each advance of the turret. Thus, each wiper engages with its trip arm during each rotation of the drum 362. The times of operation of the blow. valve may be varied by adjusting the corresponding wipers around the periphery of the drum 362. The trips should first be positioned opposite the points at which it is desired to actuate the respective valves, andthen their respective wipers should be adjusted so as to engage the trips when the valves are in operative relation thereto. By the construction described, the counterblow pressure may be turned on and off at any time during the dwell of the molds at the counterblow station B and the finishing blow pressure may be turned on and off at any time that may be desired after the molds leave station C and before they leave station F, either during the dwell or the traverse of the molds.

Stations D, E and F are included broadly under the heading of blow stations, although the blowing may not occur at all of them, and position of these stations is not essential to the blowing operation. When the blow pressure is cut off by closing the valve 334, the cup 314 and clamp ring 311 will be lifted from the blow mold by the action of the spring 307, and as the molds leave station F, the blowhead will be elevated and swung to one side, in which position the molds and associated parts arrive at Station A.

While I have shownand described but one embodiment of my invention, it is obvious that many modifications might be made therein, many of the individual features might be used in other combination-s without departing from the spirit of the invention as set forth in the appended claims, which are to be construed as broadly as the state of the prior art permits.

I claim:

1. In a blowhead for use with the mold of a glass blowing machine, the combination of a cylinder, a piston on which the mold-engaging parts of the blowhead are eccentrically mounted, means to permit rotation of the pis- ,.ton in the cylinder to adjust the mold-engaging parts laterally of the mold, and means for supplying pressure to the cylinder to move the mold-engaging parts toward the mold.

2. In a glass blowing machine, the combination of a mold, a blowhead, a reciprocating rod for moving the blowhead toward and from the mold, means to adjust the blowhead angularly about the rod, and means to adjust For machines in which no such adthe mold-engaging parts of the blowhead laterally into register with the mold at right an gles to the angular movement, the last named means including an adjustable eccentric rotatable about a vertical axis adjacent to the axis of said blowhead and remote from the axis of said rod.

3. In a blass blowing machine, the combination of a turret carrying a mold, means for intermittently rotating the turret, a blowhead mounted on the turret to cooperate with the mold, a valve controlling the application of pressure by the blowhead to the mold, and automatic means effective to actuate the valve, the last named means being operable independently of the rotative periods of the turret.

4:. A glass shaping machine having in combination, a turret, a plurality of valves carried thereby and connected to control an operation of the machine, a fixed actuator located adjacent the path of movement of the valves, and means for moving the actuator when each valve is in operative relation thereto. v 5. A glass shaping machine having in combination, a turret, a plurality of valves carried thereby and connected to control an operation of the machine, a continuously rotating wiper, and a fixed actuator arranged to be moved by the wiper to control the valves.

6. A glass blowing machine, having in combination, a turret, a series of molds carried by the turret, valves on the turret to control the application of blowing pressure to the molds, valve actuators positioned adjacent the path of the valves, and a continuously rotating wiper in operative relation with each actuator.

7. In a glass blowing machine, the combination with a rotatable turret, of a series of molds carried by the turret, a valve on the turret to control the application of blowing pressure to each mold, a drum mounted for movement about the turret axis, a valve actuating wiper adj ustably secured to the drum, and means for moving the drum to produce opening and closing movements of the valve.

8. In a glass blowing machine, the combination with a rotatable turret, of a blowhead mounted on the turret, a valve on the turret to control the application of pressure to the blowhead, a stationary trip arranged in operative relation to the valve as it passes, a drum rotatable about the turret axis, and a trip actuator carried by the drum.

9. In a glass shaping machine, the combination. with an intermittently rotated turret, of a valve on the turret, a stationary trip positioned adjacent to the path of the valve, a continuously rotating drum, and a trip actuator mounted on the drum by which the valve is actuated when the parts are in operative relation.

10. A glass blowing machine, having in combination, a turret, a series of molds carried by the turret, a valve on the turret for each mold, a valve opening trip and a valve closing trip adjacent to the path of the valves, a continuously rotating drum carrying a wiper in operative relation with each trip, means to permit independent adjustment of the positions of the trips, and means to permit independent adjustment of the positions of the wipers on the drum.

11. In a glass blowing machine, the combination of a rotatable turret, means for intermittently rotating the turret, a series of blowheads and blow controlling valves mounted on the turret, a continuously rotating wiper, and an actuator for moving the valves under the action of the wiper, the actuator being adjustable to position it to operate the valves at any time during or between the rotations of the turret.

, 12. In a glass blowing machine, the combination of a rotatable turret, a series of blow controlling valves on the turret, a plurality of continuously rotating wipers, and a fixed valve actuator in operative relation with each wiper and adapted to move the successive valves as they are positioned in operative relation thereto by the rotation of the turret.

13. In a glass blowing machine, the combination, with a turret intermittently rotated to advance a series of molds to successive operating stations, of a valve on the turret to control the application of-blowing'pressure to the molds, a valve opening trip and a valve closing trip in operative relation to the valve at its opening and closing positions respectively, a continuously rota-ting drum, and a wiper on the drum for operating each trip to actuate its valve, the position of said wipers being adjustable with respect to the drum.

14. In a glass blowing machine, the combination of a parison mold, a split neck ring associated therewith, a split blow mold, a blowhead adapted to cooperate alternately with said molds respectively to counterblow the parison and finish blow the article, and

, means associated with said blowhead for cooperation alternately with said neck ring andsaid blow mold for holding the split sections of each closed during the respective blows.

1 5. In a glass blowing machine, the combiinc nation of a parison mold, a neck ring associated therewith, a blow mold, a blowhead adapted tocooperate alternately with said molds respectively to counterblow the parison andfinish blow the article,.1neans associated with said head to form a substantially airtight seal with said neck ring during the counterblow, and additional meansassociated with said head to form a substantially airtight seal with the neck of the'article bein blown during the finish blow.

I 1f}. In a glass blowing machine, the combi- 113131011 of anintermittently rotating turret,

a parison mold and a blow mold mounted on said turret, a blowhead rotatable with said turret cooperating alternately with said pariso'n mold to counterblow the parison and with the blow mold to finish blow the article, a valve for controlling the passage of blowing air to said blowhead, and automatic means operable to open or close said valve for both counterblowing and finish blowing, the last. named means being operable independently of the rotative periods of the turret.

17 In a glass blowing machine, the combination with a mold of a cooperating blowhead including a piston operating the mold-engaging parts of said blowhead, means for moving said piston to move said parts to moldengaging position by the blowing pressure including a relatively small valved opening between the source of blowing pressure and the space above said piston for limiting the speed of the starting movement of said piston, and a relatively largeport between. said source and the space above said piston, said port adapted to be uncovered by said piston after a predetermined initial movement.

18. In a glass blowing machine, the combination with a mold of a cooperating blowhead. including a piston operating the mold-engagmgparts of said blowhead, means for movmg said piston to move said parts to mold-engaging position by the blowing pressure including a relatively small valved opening between the source of blowing pressure and the space above said piston for limiting the speed of the starting movement of said piston, a relatively large port between said source and the space above said piston, said port adapted to be uncovered by said piston after a predetermined initial movement, and a port between the space above said iston and said mold-engaging parts through I which the blowing air must pass to the arti- 'cle being blown, the'last named port being -covered except after a predetermined move ment of said piston.

19. In a glass blowing machine, the combination of a turret carrying a mold, means forintermittently rotating the turret, a blow head mounted on the turret to cooperate with the mold, a valve controlling the application of pressure by the blow head to the mold, and

automatic means to actuate the valve to apply blowing pressure by the blow head to the mold for a selected period of time during and between intermittent rotations of the turret. 20. In a glass blowing machine, the combination of a rotatable mold carrier, a' mold thereon, mea'nsfor intermittently rotating said carrier, a blowhea-d mounted to travel with said carrier and cooperate with said mold to blow a glass article therein, valve means for controlling the application of pressure to said blowhead, means elfective during the movement of said carrier and said mold 5 between two adjacent dwell stations for operating said valve means to admit pressure to said blowhead and thence to the interior of a glass article in said mold, and means effective during movement of said carrier and said mold after the parts have passed through at least one dwell position during which pressure to said blowhead is maintained foroperating said valve means to cut ofi' the flow,

day of February, 1928.

EDWARD LORENZ. 

